Have a pile of the alphabet letters cut outs. Add several more vowels and the other letters that can be double used in a word. Each group gets a pile of these letters. You can divide the class into how many groups you want, even by ones. the first group to finish spelling the word shouts "stop".,if its not correctly spelled, they continue until a group gets it. The students really learn and enjoy it. You can add several "rules " to this activity . for ex: if the children are loud, you can tell them to whisper, if not, they loose 1 point, and so on.